If their product has a defect, only they can fix. In the USA that's 1800SAMSUNG. Other places you hit samsung.com for the number.

There is one thing that I did find about images on smart tvs. You must not exceed the pixel count of the TV. So for this UHD 4K display which is 3840 pixels × 2160 lines (8.3 megapixels, aspect ratio 16:9) you need to make sure your images are that or less.

IRFANVIEW can batch convert if necessary. IRFANVIEW is easy to find with google, available on Ninite.com (why Ninite? Read https://www.howtogeek.com/201354/ninite-is-the-only-safe-place-to-get-windows-freeware/ ) and tutorials are plentiful so I'll pause here.